cmd/fuse.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2009-2013 ADVANSEE
   4  * Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
   5  *
   6  * Based on the mpc512x iim code:
   7  * Copyright 2008 Silicon Turnkey Express, Inc.
   8  * Martha Marx <mmarx@silicontkx.com>
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <console.h>
  14 #include <fuse.h>
  15 #include <linux/errno.h>
  16
  17 static int strtou32(const char *str, unsigned int base, u32 *result)
  18 {
  19         char *ep;
  20
  21         *result = simple_strtoul(str, &ep, base);
  22         if (ep == str || *ep != '\0')
  23                 return -EINVAL;
  24
  25         return 0;
  26 }
  27
  28 static int confirm_prog(void)
  29 {
  30         puts("Warning: Programming fuses is an irreversible operation!\n"
  31                         "         This may brick your system.\n"
  32                         "         Use this command only if you are sure of "
  33                                         "what you are doing!\n"
  34                         "\nReally perform this fuse programming? <y/N>\n");
  35
  36         if (confirm_yesno())
  37                 return 1;
  38
  39         puts("Fuse programming aborted\n");
  40         return 0;
  41 }
  42
  43 static int do_fuse(struct cmd_tbl *cmdtp, int flag, int argc,
  44                    char *const argv[])
  45 {
  46         const char *op = argc >= 2 ? argv[1] : NULL;
  47         int confirmed = argc >= 3 && !strcmp(argv[2], "-y");
  48         u32 bank, word, cnt, val;
  49         int ret, i;
  50
  51         argc -= 2 + confirmed;
  52         argv += 2 + confirmed;
  53
  54         if (argc < 2 || strtou32(argv[0], 0, &bank) ||
  55                         strtou32(argv[1], 0, &word))
  56                 return CMD_RET_USAGE;
  57
  58         if (!strcmp(op, "read")) {
  59                 if (argc == 2)
  60                         cnt = 1;
  61                 else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  62                         return CMD_RET_USAGE;
  63
  64                 printf("Reading bank %u:\n", bank);
  65                 for (i = 0; i < cnt; i++, word++) {
  66                         if (!(i % 4))
  67                                 printf("\nWord 0x%.8x:", word);
  68
  69                         ret = fuse_read(bank, word, &val);
  70                         if (ret)
  71                                 goto err;
  72
  73                         printf(" %.8x", val);
  74                 }
  75                 putc('\n');
  76         } else if (!strcmp(op, "sense")) {
  77                 if (argc == 2)
  78                         cnt = 1;
  79                 else if (argc != 3 || strtou32(argv[2], 0, &cnt))
  80                         return CMD_RET_USAGE;
  81
  82                 printf("Sensing bank %u:\n", bank);
  83                 for (i = 0; i < cnt; i++, word++) {
  84                         if (!(i % 4))
  85                                 printf("\nWord 0x%.8x:", word);
  86
  87                         ret = fuse_sense(bank, word, &val);
  88                         if (ret)
  89                                 goto err;
  90
  91                         printf(" %.8x", val);
  92                 }
  93                 putc('\n');
  94         } else if (!strcmp(op, "prog")) {
  95                 if (argc < 3)
  96                         return CMD_RET_USAGE;
  97
  98                 for (i = 2; i < argc; i++, word++) {
  99                         if (strtou32(argv[i], 16, &val))
 100                                 return CMD_RET_USAGE;
 101
 102                         printf("Programming bank %u word 0x%.8x to 0x%.8x...\n",
 103                                         bank, word, val);
 104                         if (!confirmed && !confirm_prog())
 105                                 return CMD_RET_FAILURE;
 106                         ret = fuse_prog(bank, word, val);
 107                         if (ret)
 108                                 goto err;
 109                 }
 110         } else if (!strcmp(op, "override")) {
 111                 if (argc < 3)
 112                         return CMD_RET_USAGE;
 113
 114                 for (i = 2; i < argc; i++, word++) {
 115                         if (strtou32(argv[i], 16, &val))
 116                                 return CMD_RET_USAGE;
 117
 118                         printf("Overriding bank %u word 0x%.8x with "
 119                                         "0x%.8x...\n", bank, word, val);
 120                         ret = fuse_override(bank, word, val);
 121                         if (ret)
 122                                 goto err;
 123                 }
 124         } else {
 125                 return CMD_RET_USAGE;
 126         }
 127
 128         return 0;
 129
 130 err:
 131         puts("ERROR\n");
 132         return CMD_RET_FAILURE;
 133 }
 134
 135 U_BOOT_CMD(
 136         fuse, CONFIG_SYS_MAXARGS, 0, do_fuse,
 137         "Fuse sub-system",
 138              "read <bank> <word> [<cnt>] - read 1 or 'cnt' fuse words,\n"
 139         "    starting at 'word'\n"
 140         "fuse sense <bank> <word> [<cnt>] - sense 1 or 'cnt' fuse words,\n"
 141         "    starting at 'word'\n"
 142         "fuse prog [-y] <bank> <word> <hexval> [<hexval>...] - program 1 or\n"
 143         "    several fuse words, starting at 'word' (PERMANENT)\n"
 144         "fuse override <bank> <word> <hexval> [<hexval>...] - override 1 or\n"
 145         "    several fuse words, starting at 'word'"
 146 );